Stopping mechanism.



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STOPPING MECHANISM. APPU CATION FILED MAR. 18, 19H;-

Pmma Jim. 16,191.17.

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i www M G S. HiLL,

STOPPQNG MEfiHANlSM.

APPLICATION man MAR. f8, 1916.

19% 1 @48 Patent-ed Jan. 18, 191?,

2 SHEETS SHEET 2.

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v, UNITED, sTi TEs PATENT o I GEORGE s. HILL, or s'rnarronnnnw HAMPSHIRE; ASSIGNOR are 'onnrnn anon MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A conrcuairrcia or New JERSEY.

STOPPING MECHANISM. v

1,212,486. Original application filed April 27, 1914,

the following to be a full, clear, andlexact description of the invention, such as will enable others skilled in the art to WhlCh/lt ap pertains to make and'use the same.

The invention relates to stopping echanism for buttonhole sewing or othe machines in which the machine orsome mechanism of the machine is to be stopped in predetermined position.

The present application is a division of theco-pending. application of applicant, Se-

rial No. 834,720, filed April 27, 1914,'for improvements in stopping mechanism.

The object of the invention is to provide novel and improved means by which the op orator may readily and conveniently adjust the stopping mechanism in accordancewith the speed of the machine.

Tothis end the invention consists in the features of construction and combinations of parts hereinafter described and referred toin the claims.

The features of the invention will be readilyunderstood from an inspection of the accompanying drawings, and the following'detailed description of the mechanism illustrated therein.

In the drawings,

. vation showing so much of a buttonhole sewing machine as is necessary to illustrate the application of'the invention thereto; Fig.

v anism; and Figs. 4, 5 and 6 are details of 2 isa detail sectional view showing the parts in stopping position; Fig. 3 is a sectional plan view of the driving and stopping mechthe devices for engaging and disengaging the driving clutch.

In the drawings the invention is shown embodied in a buttonhole sewing machine having the general construction and mode of operation of the machi e shown and described in Patent No. 1,063, 86, June 3, 1913. In this machine the stitch forming mechanism and the mechanism for feeding thework clampare driven during the sewing .ofjthe buttonhole from a driving shaft 2. Tho -mechanism for-=1 driving andstopPing Specification of Letters Patent.

Figure 1 is a front eleon the clutch disk.

Patented Jan. 16, 1237.

Serial No. 834,720. Divided and this application its March 18, 1916. SerialNo. 85,135.

the shaft comprises a continuously rotating driving pulley L which is loosely mounted on a sleeve 6 surrounding the shaft. The pulley is provided with an internal ch ch face adapted to coiiperate with a clutch disk 8 whichis fast to the shaft. The pulley is forced in a direction to engage the clutch members by a spring 10 interposed between the end of the sleeve 6 and a knurled head 12 secured to the end of the shaft. The pulley is moved against the tension of the spring 'todisengage the clutch members through pins 14: which pass through the hub of the clutch disk 8 and are interposed between the end of the sleeve 6 and a bearingplate 16 which loosely surrounds a sleeve 18.

A ball bearing 20 is interposed between the disk 16 and the end of a clutch actuating sleeve 22 which is mounted to turn loosely on the sleeve 18. 'The sleeve 22 is provided with two cam seg1nents 24 arranged to cooperate with cam segments 26 formed on a stationary disk 28 in moving "the driving pulley against the tension of the spring 10 to disengage the clutch members, and in allowing the pulley to be moved in the opposite direction by the spring to engage the clutch members. The (cam sleeve 22 is rocked in a direction to disengage the clutch members by a rack 30 formed on the upper end of a vertically movable bar32, the lower end of which rideson a cam rib 34 secured to the upper face of the cam carrying gear 36. When the bar 32 rides up onto thecam r rib, the cam sleeve 22 is rocked so that the cams 24 and 26 force the sleeve in a direction todisengage the clutch members.v 'When the bar rides off of the cam rib, the sleeve is allowed to rock-in the opposite direction so 7, that the spring 10 engages the clutch mem bers.

When the members of the driving clutch are'disengaged, the shaft 2 is Stopped in a predetermined position by a stop arm .38

carrying a stud 40 which cooperates with a stop cam 42 connected with the clutch disk' 8.- The stop cam is mounted on the hubof the clutch disk 8, and is connected tl iere-v with by. a pin M which passes "through-a segmental slot formed in; the clutch disk,

and is engaged by-one'end f-a spring 46,

bears against'a lug."

the other end of'which stop arm 38 is.,securedto with a rock shaft 50, and is connected witl a spring 52 which yieldingly supports the arm in position with the upper end of the shaft against a stop screw 54, and also tends to swing the arm in a direction to bring its stud into the path of the stop cam 42. When the clutch members are in engagement, the stop arm is held out of the path o" the cam 42 against the tension of the spring 52 by a cam 55 on the carrying gear 36 which engages an arm 56 on the lower end of the shaft 50. The cams 34 and 55 are so arranged. that when the lutch members are disengaged the arm 56 is released so 5 that the spring 52 may swing the stop arm 5 cam 42, which depresses the stop arm i cam, as indicated in Fig. 2. as

against the tension of the spring 52', thus gradually overcoming the momentum of the parts. As the end of the stud rides off the portion of the cam, it is engaged by the I abrupt rise 62, so that the shaft 2 is brought to rest with the end of the stud in the low part or depression between the braking portion 60 and the stopping portion 62- of the When the stop arm swings into active position, the stud 40 rides against a wear plate 64 which is secured to the rear face of the cam 42 and acts to accurately position the stud with relation to the cam. In order that the stopping mechanism may operate in the most efiicient manner, and. wlth the minimum shock and jar, it is desirable that the point in the rotation of p the shaft at which the clutch members are disengaged should be varied in accordance with the speed at'which the machine is being driven. If the speed increases at any time during the operation of the machine, the clutch members should be disengaged arlier in the rotation of the shaft, in order that the momentum of the parts may be properly overcome before the shaft reaches the stopping position. If the speed decreases, on the other-hand, theciatch memi5 bers should be disengaged later, in order that the parts may be brought to stopping position by the momentum of the parts. I teens is accordingly provided by which the the timing of the clutch In the construction shown, this is accom plished bv forming worm teeth on the eriphery of the stationary cam disk 28, which are engaged by aworm 66 secured on a shaft 68. The shaft is provided with a operator may quickly and conveniently vary. disengaging devices.

knurled head 70 which is in position where it may be conveniently manipulated by the operator during the running of the machine, in case it is found desirable to vary the timing of the'disengagcmcnt of the clutch by reason of any variation in the speed of the driving mechanism through which the manism so that the parts will be brought to rest in proper position without undue shock or jar, in case she finds that the stopping mechanism is not operating properlyand efficiently.

lVhile it is preferred to employ the specific construction and arrangement of parts shown and described in embodying the invention in the machine illustrated in the drawings, it will be understood that the invention is not confined in its application to this machine, and that the construction and arrangement of the parts ma y be varied and modified as found desirable or best suited I to the construction of the machine in which it is to be embodied.

Having explained the nature and object of the invention, and specifically described one form of mechanism in which itmay be embodied, what is claimed is 1. A machine of the class described, having, in combination, a shaft, mechanism for automatically throwing off the power, stopping devices for stopping the shaft in a definite position, and means (within convenient reach of the operator for adjusti the timing of the power throw-off mechanism with relation to the stopping position.

2. A machine of the class described, having, in combination, a shaft, mechapism for automatically throwing 01f the powenta stop cam on the shaft, a retarding and stopping plunger coiiperating with the cam to stop the shaft in a definite position, and means within convenient reach of the operator for adjusting the timing of the power throw-off mechanism with relation to the stopping position.

3. A machine of the class described, having, in combination, a shaft, mechanism for automatically throwing off the power, a stop team on the shaft having an eccentric brak- ,ing portion and a stopping depression, a

spring pressed plunger cooperating with the cam to retard and stop the shaft, and means adjusting the timing of the power throwofi mechanism with relation to the stopping position. Y

4. A machine of the class described, having, in combination, a shaft, driving mechanism-therefor, mechanism for automatically throwing ofl the power and-forv retarding and stopping the shaft in' a definite ps1-,

tion, and devices for regulating the relative operation of the power throW-ofi' and the retarding and stopping mechanism arranged for manual adjustment b" the operator While running the machine.

5. A machine of the class described, having, in combination, a shaft, driving mechanism therefor, stopping devlces for stopping the shaft in e definite position when the power is thrown off, a rocking cam sleeve for throwlng off the power, a cooperating stationary cam disk, an adjusting shaft connected to adjust the stationary disk and provided with a head within convenient reach of the machine operator.

6. A machine of the class described, having, in combination, a shaft, a driving clutch, stopping devices for stopping the shaft in a predetermined position when the clutch is disengaged, a rocking cam sleeve' for disengaging the clutch, a cooperating stationary cam disk provided with teeth, and a manually operable worm engaging said teeth. i

7. A machine of the class described, having; in combination, a shaft, a driving clutch, a rocking cam sleeve for disengaging the clutch, a 'cam connected to, rock the sleeve, a stationary cam disk cooperating with the ciun sleeve, teeth on the periphery of the disk, and-a manually operable worm engaging the teeth. e

. GEORGE S. HILL. 

